Other
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..354g&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, May 1984, p. 354-365. Research supported by the Smi
Other
4
Late Stars, Magnesium, Metallicity, Stellar Luminosity, Stellar Spectrophotometry, Absorption Spectra, Elliptical Galaxies, K Stars, Stellar Gravitation, Stellar Temperature
Scientific paper
Measurements of the strength of the 5174 A Mg b + MgH feature are presented for a sample of solar neighborhood stars, ranging in spectral type from B to M. The data were obtained by the use of two 70 A FWHM interference filters and a single-channel photometer. In agreement with previous investigations, the absorption is seen to vary with stellar temperature and gravity. It does not appear to correlate very well with Fe/H abundances determined by spectroscopic techniques, despite theoretical expectations to the contrary. If this lack of correlation is not merely the result of errors in the Fe/H measurements, it may indicate that Mg/Fe variations exist among the G and K stars. Since the Mg b + MgH absorption appears to correlate with other metallicity features in the spectra of E galaxies, it is suggested that the metal abundance spread in such galaxies is larger than that among the solar neighborhood stars studied in this investigation.
Guinan Edward F.
Smith Graeme H.
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